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I just tried to change 13em by 130pt, and my text is now centered !
it seems to me that it's a bug with text width attribute in em.
anymay,
solved !

I didn't manage to make it work with varwidth . But, thinking about it, I may have an other solution.

Is it possible to get the value, for example, of the node radius? In that case, I could define a much more accurate text width value, and my text will be centered.

For example something like that ...

hello again

I just tried my solution, and it works quite fine.

But I still have one problem :
as in the exemple in your first answer,
when I define a text width,
the centering doesn't work well : the text is centered, but closer to the left than to the right.

I guess it's because the desired ...

I don't see that necessity.

I want automatic small circles (so small text width) when there is few words, and big circles when there is a lot of words (large text width),

if it's not done automatically, I have to calculate the width, and it seems to me that the desired size is proportional to ...

thank you for your answer, and your welcome :).

I have a lot of such graphs in my file, so I would like to define the width automatically...

I generate the tex file with a (haskell) code, so I can implemente any function ; do I have to count the words in each node and set the width to something ...

hello,

I use tikZ to draw a mindmap. My problem is that my text is rendered in a high thin column, instead of a block, like this:
bulles.jpg

Here is my code :
\makebox{
\begin{minipage}{\linewidth} \centering
\begin{tikzpicture}[mindmap,level 1 concept/.append style={level distance=150 ...